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Šw‚ԁE‹³‚¦‚éD‚b‚n‚l > ’†ŠwŽóŒ± > ŽZ” > ŒvŽZ > —ûK–â‘è‚Q‚R > ‰ð“š
@uÀE–â‘èW
@
i‰ð“šj
 
  (2-1€2)~(2-2€3)~(2-3€4)~(2-4€5)~ c ~(2-997€998)~(2-998€999)
=
(2-   1   )~( 2-   2   )~( 2-   3   )~( 2-   4   )~ c ~( 2-   997   )~( 2-   998   )
2 3 4 5 998 999
=
3   ~   4   ~   5   ~   6   ~ c ~   999   ~   1000
2 3 4 5 998 999
=
1000
2
= 500
 
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